Cessna TR182 1979 Pilot Operating Handbook page 205

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
GROUND SERVICE PLUG
RECEPTACLE
MODEL TR182
The ground service plug receptacle circuit incorporates a polarity
reversal protection. Power from the external power source will flow only
if
the ground service plug is correctly connected to the airplane. If the plug is
accidentally connected backwards, no power will flow to the electrical
system. thereby preventing any damage to electrical equipment.
SECTION 5
PERFORMANCE
There is no change to the airplane performance when the ground
service plug receptacle is installed.
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